RIDGE WASHER Pressure Washer Undercarriage Cleaner, 16 Inch Undercarriage Washer, Hydraulic Powered Under Car Cleaner with Straight Extension Wand, 4000 PSI

Just used it to foam the undercarriage for the first time and it worked great. Very well built. I use this one to foam and I have a different one to rinse. That makes it easier, so you don't need to change out the nozzles.

I have a 1700 psi pressure washer. This assembly worked well with it for rinsing road salt off of my car's undercarriage.

This product works great. I use it to clean iPhone my Raptor after a weekend driving on the beach. The regular spray nozzles have a decent jet with a 2000 psi pressure washer. It takes a few passes on each side to wash down an F150. I changed out the nozzles to foam on saltaway underneath. I did not use the black nozzle that came with the kit , but I used a variable spray nozzle on the foam cannon to get my wheels and wheel wells after the undercarriage. This did as good or better than the more expensive foam cannon I use for regular washing

Strong spray, easy to use, reaches everything. It won't strip paint but you don't really want 15000psi hitting your break lines. Use it to spray off the salt in the winter and mud in the summer.

With 7 nozzles it requires fewer passes under my car to rinse the salts off.
Quality is very good. All parts are stainless steel and the wheels look like skate board wheels with ball bearings. My pressure washer is 3gpm at 3400psi and I have a pressure gauge on it which peaked at 500psi which is fine for rinsing and the extensions work as expected.
If you’d pressure washer is less than 3 gpm get the smaller unit or you can remove & plug one of the nozzles if desired.
Not a big deal but if would be advisable to lubricate the wheel & bearings after each use to preserve them, this is just common sense practice.
Excellent quality and would buy again.